Spring



W. KRAFVE.

SPRING.

APPLICATION FILED DEC. 12, 1919.

Patented Oct. 5, 1920.

@womtoa UNI D STATES 'mTE- T" OFFICE.

WILLIAM KRAFVE, 0F FALL RIVER, MASSACHUSETTS.'

, I SPRING.

To all whom it may concern: Be it known that I, WILLIAM KRAFVE, a

' citizen of the United States, residing at Fall iver, in the county of Bristol and State of Massachusetts, have invented new and useful Improvements in Springs, of which the following is a-specification.

' vided with connectors formed by simply bending the top leaf over to form a loop, but this structure is objectionable since in going over rough roads the unsupported simple and loop vis subjected to constant strain and an opening tendency, with the result that the loop is crystallized and soon breaks.

The primary aim of the present invention is to provide an improved form of spring in which a permanent rigid loop is formed at each end of the spring, and in which the loop is reinforced so as to give it additional strength.

The inventionfurther aims to provide a economical structure and one of great strength andlongevity.

In the drawings: a Figure 1 is a top plan'view of the invention.

Fig. 2 is a side elevation, and

ig. 3 is anenlarged section on line 33 of Fig. 1.

In proceeding in accordance with the present invention the usual form of leaf spring structure 1 is employed, the top leaf 2 of which is looped at its ends at 3 and formed with a flat part 4 which seats on the upperface of the top leaf 2. has its free end 5 turned upwardly to form a stop for a clip 6, thereby to prevent movement of the clip longitudinally of the spring. Longitudinal movement of the clip in the reverse direction is prevented by the vertical part 7 of the loop 3. The clipis secured in position by means of the bolts 8 which latter are engaged on opposite sides of the Application filed December 12, 1919. Serial No. 344,387.

spring structure 1 and on opposite sides of the flat part 4 so as to prevent the loop terminal from shifting laterally of the spring structure 1.

For the purpose of reinforcing the loop and imparting additional strength thereto the second leaf 9 is formed with ,a loop. 10 -wh ich is conformably engaged with and about the loop 3and extends over the top of the latter and beyond the suspension point thereof.

From the foregoing it w'ill beapparent that it is impossible forthe loop .tqopen or otherwise move, due to its positive an chorage effected by the clip, the flat part 4 and the stop parts 5'and 7. Further the loop itself 'is reinforced by the durable and efiicient structure results.

curved end; 10 of the -under leaf 9, sojthat a strong Specification of Letters Patent. Patented O t, 5, 192() I It'will be understood. that the structure" at each end of the spring is identical as described in the foregoing.

Having thus described my invention, what I claim as new and desire to secure by Letters-Patent is:x

1,. In a spring, a leaf structure having the ends of the top leaf loopedover and provided with flat parts seating on the top face of the top leaf, the free terminals of the Iiat parts being bent upwardly to form stops, clips seating on the top faces of the'flat parts and disposed between the stops and the adjacent sides of the loops, and bolts engaged with the opposite sides of the fiat part for securing the clips in position, the ends of the second leaf being bent over and supferimposed upon the loops of the first lea 2. In a spring, a 'leaf structure having the ends of the top leaf looped over and provided with fiat parts seating on the top face pf the top leaf, the free terminals of the flat parts beng bent upwardly to form stops, and means between the stops and the adjacent parts of the loops for securing the flat parts downwardly onto the topleaf.

3. In a spring, a leaf structure having the ends of the top leaf looped over and prothe top leaf having its ends bent around andseated upon said loops.

4:. In a spring, a leaf structure having the ends of the top leaf formed with loops. and means. for securing said loops rigidly 10 in position. the ends of the underlving leaf being bent to engage over and around and seating upon said loops.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WILLIAM KRAFVE.

Witnesses BESSIE P. TooMEY,

A. MILLER. 

